install mingw64 on win8.1
1. Download mingw-w64 and msys2
2. Install mingw-w64,exe, here I select x86_64 for Architecture with Win8.1
3. Press “window icon + x“ to click the windows Control Panel →All Control Panel Items →System→Advanced System Settings .[Advanced] Enviornment Variables →System variables →[Path] inputs “;C:\(or D:\)MinGW\mingw64\bin;“
4. Verify the GCC with commands (See the version means install success.) →gcc -v →g++ -v →gdb -v









